【摘要】 研究了 Fe,Si,Na,K杂质及 Ce微合金化对 A l-L i-Cu-Zr及 Al-L i-Mg-Zr合金内、外韧化水平的影响 .杂质降低了 Al-L i-Cu-Zr合金的内韧化水平 ,从而降低了其总体韧化水平 .由于 Al-L i-Cu-Zr合金中添加微量 Ce可明显提高材料的内韧化水平及抑制杂质的脆化作用 ,故可改善合金的断裂韧性 .对于Al-L i-Mg-Zr合金 ,Ce的微合金化不能提高材料的韧化水平更多还原

【Abstract】 The effects of the impurities Fe,Si,Na,K and a rare earth addition Ce on the intrinsic and extrinsic toughening levels of the alloys Al\|Li\|Cu\|Zr and Al\|Li\|Mg\|Zr were investigated. The reduction in the toughening level for the alloy Al\|Li\|Cu\|Zr with more impurities is because the impurities impair the intrinsic toughening level. An improvement on the fracture toughness can be made by adding a fixed amount of Ce element to the alloy Al\|Li\|Cu\|Zr. The reason behind this is that Ce microalloying can not only enhance both the intrinsic toughening level and the extrinsic toughening level but suppress the embrittling behavior of the impurities. Ce microalloying can not produce beneficial effect on the toughening level for the alloy Al\|Li\|Mg\|Zr.更多还原